Yes
Ronald Reagan's wife, Nancy Reagan, has not died yet. She is currently in her 90's.
No George Washington was not the oldest president. Ronald Reagan was the oldest elected president at the age of 69 when he was elected to his first term. He ended his presidency a few months before his 78th. George Washington was 57 when he was elected.
After Trump, the next-oldest was Ronald Reagan, who took office just a few weeks before his 70th birthday.
Ronald Reagan divorced his first wife.
Oldest was Ronald Reagan, who was elected at age 69. Youngest was John F. Kennedy, elected at age 43. However, Theodore Roosevelt assumed office at 42 years old (he was not elected).
Mike Pence
As of 2018, the only US President to begin his term at or over 70 is Donald Trump. Ronald Reagan was less than a month from turning 70 when he started.
People voted for him and he got the electoral votes.
Donald John Trump
Presidents John Tyler, Millard Fillmore, Benjamin Harrison, Theodore Roosevelt, and Woodrow Wilson all remarried after the death of a first wife. Ronald Reagan remarried after divorcing his first wife.
Donald Trump's middle name is John. His full name is Donald John Trump, Sr.
If Donald Trump is legally elected, he should be President. Our system of government is based on the idea that the voting public has enough sense to elect the best choice.